目前国内因整体检定0.02级直流电桥的需要而生产了0.005级ZX78型电阻箱,这里提出一种用它作标准能够将零电阻的干扰预先排除而简单快速地对各种电阻箱之类累进电阻值作检定的方法。一、原理本方法采用双桥法。QJ36型直流电桥接成双桥线路如图1,双桥平衡条件为众所周知,它的近似平衡式为: At present, due to the overall verification of 0.02 DC bridge needs and the production of a 0.005 ZX78-type resistance box, here proposed as a standard for its use can be zero-resistance interference pre-ruled out simply and quickly on a variety of resistance boxes like progressive resistance Value for the verification method. First, the principle of this method double bridge method. QJ36 DC bridge into a double bridge line in Figure 1, double bridge balance conditions are well known, its approximate balance type is: